全文获取类型
收费全文 | 8070篇 |
免费 | 90篇 |
国内免费 | 244篇 |
专业分类
安全科学 | 159篇 |
废物处理 | 394篇 |
环保管理 | 920篇 |
综合类 | 1357篇 |
基础理论 | 1976篇 |
污染及防治 | 1993篇 |
评价与监测 | 607篇 |
社会与环境 | 950篇 |
灾害及防治 | 48篇 |
出版年
2023年 | 58篇 |
2022年 | 130篇 |
2021年 | 104篇 |
2020年 | 67篇 |
2019年 | 99篇 |
2018年 | 145篇 |
2017年 | 154篇 |
2016年 | 213篇 |
2015年 | 159篇 |
2014年 | 259篇 |
2013年 | 696篇 |
2012年 | 280篇 |
2011年 | 375篇 |
2010年 | 310篇 |
2009年 | 342篇 |
2008年 | 394篇 |
2007年 | 401篇 |
2006年 | 308篇 |
2005年 | 291篇 |
2004年 | 288篇 |
2003年 | 280篇 |
2002年 | 267篇 |
2001年 | 339篇 |
2000年 | 216篇 |
1999年 | 115篇 |
1998年 | 86篇 |
1997年 | 84篇 |
1996年 | 107篇 |
1995年 | 126篇 |
1994年 | 96篇 |
1993年 | 85篇 |
1992年 | 90篇 |
1991年 | 92篇 |
1990年 | 79篇 |
1989年 | 71篇 |
1988年 | 69篇 |
1987年 | 75篇 |
1986年 | 52篇 |
1985年 | 63篇 |
1984年 | 63篇 |
1983年 | 59篇 |
1982年 | 58篇 |
1981年 | 64篇 |
1980年 | 47篇 |
1979年 | 46篇 |
1977年 | 38篇 |
1976年 | 36篇 |
1974年 | 34篇 |
1973年 | 43篇 |
1972年 | 51篇 |
排序方式: 共有8404条查询结果,搜索用时 15 毫秒
911.
Katrine Banke Nørgaard Nina Cedergreen 《Environmental science and pollution research international》2010,17(4):957-967
Background, aim and scope
The ergosterol biosynthesis-inhibiting (EBI) fungicide prochloraz can enhance the effect of other pesticides in a range of animal species. Approximately 50% of the fungicides used in Denmark are EBI fungicides. Hence, if they all have synergising potential, a risk assessment of pesticide mixtures based on additivity might not suffice. This study investigates the synergising potential of six different EBI fungicides representing the imidazoles (prochloraz), the triazoles (epoxiconazole, propiconazole and tebuconazole), the piperidines (fenpropidin) and the morpholines (fenpropimorph) together with the pyrethroid insecticide alpha-cypermethrin. 相似文献912.
913.
914.
915.
916.
917.
Intrauterine fetal growth restriction (IUGR) is an important pregnancy complication associated with significant adverse clinical outcome, stillbirth, perinatal morbidity and cerebral palsy. To date, no uniformly accepted management protocol of Doppler surveillance that reduces mortality and cognitive morbidity has emerged. Aortic isthmus (AoI) evaluation has been proposed as a potential monitoring tool for IUGR fetuses. In this review, the current knowledge of the relationship between AoI Doppler velocimetry and preterm fetal growth restriction is reviewed. Relevant technical aspects and reproducibility data are reviewed as we discuss AoI Doppler and its place within the existing repertoire of Doppler assessments in placental insufficiency. The AoI is a link between the right and left ventricles which perfuse the lower and upper body, respectively. The clinical use of AoI waveforms for monitoring fetal deterioration in IUGR has been limited, but preliminary work suggests that abnormal AoI impedance indices are an intermediate step between placental insufficiency-hypoxemia and cardiac decompensation. Further prospective studies correlating AoI indices with arterial and venous Doppler indices and perinatal outcome are required before encorporating this index into clinical practice. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
918.
919.
920.
N. A. Kalashnik 《Russian Journal of Ecology》2008,39(4):261-271
The level of chromosome aberrations at different stages of mitosis has been studied in the seed sprout meristem of four conifer species growing in the Southern Urals in areas differing in the kind and degree of industrial pollution. The results provide evidence for the adverse effect of pollution on the chromosomal machinery of these species. With respect to environmental quality assessment, the Scots pine is the most sensitive indicator species among conifers growing in the Southern Urals and analysis of chromosome aberrations in anaphase-telophase cells is most effective among the cytogenetic methods tested. 相似文献